leonard and s



W. H. LEONARD AND S. V. JOHNSON.-

TOOL RETAINER. PPLICATION FILED MAY 25. 1912 la'ltenred June 24, 1919 2 SHEETS SHEET I h v P 1 Y P W. H. LEONARD AND S. V. JOHNSON.

TOOL RETAINER.

I91 I 1,307,91 1 Patented June 24, 1919. v

' 2 SHEETSWSHEIET'Z.

UNITED STATES PATENT OFFICE;

WILLIAMH. LEONARD AN sULLTvA v. JOHNSOLIT, 0E DENVER, ooLonADo, ASSIGNORS TO THE DENVER ROCK DRILLMANUFAGTURING COMPANY, OF DENVER, COLORADO,

A CORPORATION OF COLORADO.

TooL-EETAI EEE.

Specification of Ztetters latent. Pflfentd June 24, 1919,

Application filed May as, 19 17. .sermmim To all whom it may concern Be it known that we, WI ETAM H.LEon- ARD and SULLIVAN V. JOHNSON, citizensof the United States, residing at Denver, 1n

the county ofDenver and State of Colorado,

have invented certain new and usefulImprovements in Tool-Retainers, ofwhich the followingis a specification. a

The present invention is directed to improvements in f tool retainers, and while more particularly designed for use on drilling apparatus, itwill be of courseobvious that it is not necessarily limited thereto.

One of the primary objects of the invention is to provide a novel and simple retainer so fashioned that the resiliency thereof will serve to permit its movement under. straw and secure its automatlc returntoflts normal position when released.

Still another and important object of the invention, is to provide means whereby when the retainer is moved'forwardly underthe action ofthe tool it will bepositively locked against pivotal movement, and consequently prevent theretainer from accidentally disengaging the tool. a a

In the drawings: I i Figure 1 is a perspective View of the device. i a

Fig. 2 is a top plan view e Fig. 3 is a side elevation with. the retainer locked in its operative position.

Fig. 4: is aside elevation with the retainer in its inoperative position. 1

Fig. 5 -is a detail longitudinal sectional viewthrough one of thepivot connections and the adjacent parts. i a Fig. 6 is a cross sectional View. Similar referencenumerals designate corresponding .parts in all the figures of the drawings. Referringto the drawings, 1 designates a head which constitutes a holder for receiving the drill steel 2, said steel being m vided with the usualcollar 3. ,Upon diametrically opposite sides of the holder are formed lugs 4:, the same being. provided with forwardlyand outwardly inclined faces 5. These lugs are furtherf provided. with sockets 6. i I i I The retainer comprises a yoke 7 which is formed from resilient metal, preferably round in cross section, said yoke having a lateral open loop 8 adaptedto embrace the steel 2,butof such size as to prevent the collar 3 from passing therethrough.

The sidearms 9 of the yoke have their ends provided with headslO, the inner sides 'o f which areformedwith inclined faces 11 corresponding to the faces 5 onwhich they are slidahle.

1 2 The yoke'l formed of resilient metal,

and it is therefore obvious that the faces .11 will be yieldably. pressed against the faces '5, butat the same time permit the heads 10 to slide thereon. For instance when strain is applied to the yoke incident to the engagement of the collar 3 with the loop 8, the heads 10 will slidefforwardly, and owing to the presence of the inclined :faces 5 and 11, said heads will spread. outwardly. .Upon the yoke being relieved from 'ency of the arms ,9 to contract, thus causing .theheads to sliderearwardly and returning the yoke to its normal position.

" The lugs 4h areprovided with stops 12, said stops having beveled rear sides313, which are adapted, when the yoke has movedflforwa-rd, to interlock withjbeveled the stops 12 and shoulders 14: are interlocked, as shown in Fig. 3 of the drawings, it is obvious that the yokelwill be positively prevented from swinging to its open position, thereby preventing the loop 8 the strain, the heads will automatically move toward each other owing to the tendshoulders 141 formed onthe heads 10. When i from accidentally {disengaging the steel collar 3.

I The headslO are formed with longitudi' nal slots 15, said slots being slidably engaged with headed pivot pins 16. These pins are set in the sockets 6, and retained therein by transverse pins .17 In this manner the heads 10 are slidable and pivotally connected with, the lugs It will be noted thatthe slots 15 are of such length that the steps 12 and shoulders 14 will. interlock,

thus preventing the rear walls of the slots 15 from engaging the pins 16, and by so do1ng,n0 strain ncldent to the engagement ofthe yoke with the steel, will be imparted to the pins 16.

, The lugs lare furtherprovided with reeesseslS, in which theside armsQ of the yoke snap, thus preventing the yoke from swinging accidentally to an open position.

It will be obvious of course that the stops and assume the 12 will prevent the yoke 7 from swinging 1n one direction beyond its operative position, but the yoke can be readily swungin a reverse direction to a position free of the tool, upon exerting slight pressure thereon. Assuming that the yoke 7 is in theposition shown in Fig. 2, at which time the collar 3 isobvious that the steel 2' Will be permitted to operate in the usual manner, and that the heads 10 will be in their 'rea'rinostposition.

Now should the collar 3 engagethe loop 8 and impart pressure thereto the head 10 will slide forwardly until the stops and shoulders 1 2:and'14, respectively are interlockechas shown inFigB, thereby preventing the yoke from swinging in either direct1on. As soon as a strain 1s released from the loop the tendencyof the heads 10 to move toward each other will cause said heads to. slide rear/wardly on the lugs 4 owing to thepresence of the mutually engaged inclined faces 5 and 11.. As the heads 10 slide rearwardly it is obvious that the shoulders 14; will disengage .the stops l2,

and the forward walls of the slots will engage the pins 16, thus limiting the rearward movement ofsaid heads. When the heads 10 have reached the limit of their rearward movement the yoke 7 can be swungtoopen-the device, so that the tool or steel can be readily removed or replaced in the holder. ,This' is readily accomplished sinc'eithe heads 10 when in their 35' rearmost positionare so located that-the shoulders let can swing past the sto'ps ;12, position as shown in .Fig; t. To close theyoke it is only necessar'y'to swing the same in a reverse direction and until the side arms 9 thereof snap into the recesseslS. r

From the foregoing, it 1s thought that the construction, operation and many advantages of the heremdescr bed inventlon will-be apparent to those skilled in the art, without further description, and it will'be understood that various changes in thesize,

shape, proportionand minor details of con- StI'LiOtlOll maybe resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

is disengaged from the loop 8, it

the combination with a tool nally of the tool holder, and means for caus- 'whenthe'yoke is moved longitudinally in one direction, said arms automatically returning toward each other and to normal position when the yoke is moved longitudinallyin the opposite direction.

4:. In apparatus of the character set forth, the combination with a tool, holder, of a tool retaining yoke having laterally yielding side arms that are movable longitiulinally of the tool holder, and means for causing the spreading apart of the arms when the yoke is moved longitudinally forward and automatically returning them toward each other to normal position when the yoke 1s moved rearwardly.

5. In apparatus of the character set forth,

the combination with a tool holder, of a tool retainingyoke having laterally yielding side arms that are movable longitudinally of the tool holder, and ,means on the holder and arms forpermitting the bodily forward and backward movement of the yoke and causing its side was to spread apart and resist such forward movement andautomatically to move toward each other and return to a predetermined rear position when released.

6. In apparatus of the character set forth, the combination with a tool holder, of a tool retainer having an inclined bearing disposed longitudinally of the tool holder and to the line of strain imparted to the retainer, said tool retainer movingon said hearing when engaged by a tool and being returned when released.

7. In apparatus of the character set, forth, the combination with a tool holder having an outwardly and forwardly inclined bear ing, of a tool retainer longitudinally slidable upon said bearing, said bearing constituting automatically means for resisting the forward movement of the tool retainer, said tool retainer automatically acting to be returned thereby when released.

8. In apparatus of the character set forth, holder having oppositely disposed forwardly and outwardly inclined bearing surfaces, of a tool retainer comprising a yoke having yielding side arms that bear upon said surfaces, the resiliency of said side arms and the inclination of the surfaces being such that they will afford resistance to the forward movement of the tool retainer and will automatically return the tool retainer to a rearward position when moved forwardly and released.

9. In apparatus of the character set forth, the combination with a tool holder, of a tool retaining yoke having laterally yielding side arms that are pivotally and longitudinally slidable upon the tool holder, and means for causing the spreading apart of the arms when the yoke is moved longitudinally in forth, the combination with a tool holder having forwardly and outwardly inclined bearing surfaces and outstanding pivots pr0- jecting from said surfaces, of a tool retainer comprising a yoke having sidearms provided with longitudinal slots, said side arms being of yielding material and having friction bearing on the surfaces, said side arms furthermore being provided with longitud'inal slots through which the said pivots pass. l

12. In a device of the class described, a

tool holder, of a tool retaining member formed from resilient metal, and slidably and pivotally connected with the holder, and

means operable by the lateral contraction of the member to bodily move and yieldingly maintain the latter in a predeterminedposition.

13. A device of the class described, a tool holder having inclined faces associated therewith, a tool retaining yoke having its side arms provided with heads, said heads having inclined faces for slidably and yieldingly engaging the first named faces, said faces constituting means for normally maintaining the yoke in a predetermined position and returning it thereto when removed therefrom.

14. In a device of the class described a tool holder, a tool retaining yoke having latslid'a'bly and swingingly mounted on. the holder, the lateral inherent resiliency of the arms serving to hold the yoke in its normal position and to return the same to such position after disengagement with a tool.

15. In apparatus of the character set forth, the combination with a tool holder, of a tool retainer pivoted on the holder to swing to and from a position to be engaged by a tool, and means in advance of the pivotal .connection for positively locking the re tainer against movement from said position I when engaged by a tool, while permitting its movement when disengaged by the tool. 16. In apparatus of the character set forth, the combination with a tool holder,

of a tool retainer pivoted at its rear end on the tool holder and movable from and to a position to be engaged by a tool and also capable of movement longitudinally of the tool holder when engaged by a tool, and means in advance of the pivot for positively locking the retainer against movement from said position when engaged and moved by a tool while permitting its movement when disengaged by the tool.

17. In a device of the class described, a tool holder, a tool retaining yoke pivotally and slidably mounted on the holder, and

.projections respectively on the yoke and holder in advance of the pivotal mounting that interlock upon the forward movement of the yoke to prevent the swinging movementof said yoke and disengage upon the rearward movement of the yoke to permit the swinging of said yoke.

In testimony whereof, we affix our signatures in the presence of two witnesses.

WILLIAM H. LEONARD. SULLIVAN V. JOHNSON.

. Witnesses: a

SQH. Rononr, C. M. NICHOLS.

Copies of this patent may be obtained for five cents, each, by addressing the Commissioner of Patents,

Washington, D. G.

erally resilient side arms, said arms being 

